[Refactor] to rename and re-layer the file_util stack layers.

webkit/fileapi/file_system_operation_context.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "webkit/fileapi/file_system_operation_context.h"
 
 #include "webkit/fileapi/file_system_context.h"
 #include "webkit/fileapi/file_system_util.h"
 
 namespace fileapi {
 
 FileSystemOperationContext::FileSystemOperationContext(
     FileSystemContext* context,
-    FileSystemFileUtil* file_system_file_util)
+    FileSystemFileUtil* file_util)
     : file_system_context_(context),
-      src_file_system_file_util_(file_system_file_util),
-      dest_file_system_file_util_(file_system_file_util),
+      src_file_util_(file_util),
+      dest_file_util_(file_util),
       src_type_(kFileSystemTypeUnknown),
       dest_type_(kFileSystemTypeUnknown),
       allowed_bytes_growth_(0) {
 }
 
 FileSystemOperationContext::~FileSystemOperationContext() {
 }
 
 FileSystemOperationContext*
 FileSystemOperationContext::CreateInheritedContextForDest() const {
   FileSystemOperationContext* context = new FileSystemOperationContext(
-      file_system_context_.get(), dest_file_system_file_util_);
+      file_system_context_.get(), dest_file_util_);
   context->set_src_origin_url(dest_origin_url_);
   context->set_src_type(dest_type_);
   context->set_allowed_bytes_growth(allowed_bytes_growth_);
   return context;
 }
 
 }  // namespace fileapi